Revealing mistake: At the start during the rewinding segment we see a net return to an Umbrella soldier's gun, and a guy get up on the screen left with a bullet wound in the back. (This whole part is in reverse at this point of the film) The guy that gets up you can see the outline of the squib pack that was used for the effect. (00:03:18)
Revealing mistake: Alice throws a new magazine for her gun up, and it stays in the air for a good ten seconds (adjusted for slow-mo). For something to stay up in the air, you would need to throw it a good hundred feet, and the hallway simply isn't that high. (00:22:40)
Revealing mistake: When Ada Wong kills three officers in the Umbrella Central Control Room, you can see she shot them from the front. They are sitting behind glass panels. Later, we can see the blood splatter sitting on their side of the glass, indicating that they were shot from behind. The glass is also intact, despite a bullet supposedly passing through it. (00:27:30)
Revealing mistake: When we see the Axeman slice the roof off the police car, the lights on top spark and break before the axe reaches them. (00:36:20)
Revealing mistake: When we see the Kremlin in the Rolls Royce chase, there is an overhead shot of the car skidding with tyre marks in front of the car from previous takes. (00:51:10)
Revealing mistake: When Alice shoots the zombie in the blue dress, we get a frontal shot of the gun. Pay close attention to her trigger finger: it doesn't move at all, while the gun does fire.
Answer: She must have had trouble in keeping control of the elevator's power as the impact of the explosion blew out some of the windows and the sea came rushing in.
Bunch Son